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GET ADDITIONAL DATA HERE!

chlorthal-dimethyl (Ref: DAC 893)
** dimethyl tetrachloroterephthalate ** DCPA ** dacthal ** Translations

Environmental Fate - Ecotoxicology - Human Health - A to Z Index - Home

GENERAL INFORMATION Click here for an explantaion of the general chemical status information
for chlorthal-dimethyl

Description: A residual benzoic acid herbicide for pre-emergent control of annual grasses and some annual broad-leaved weeds

Example pests controlled: Barnyardgrass; Bindweed; Nightshade; Chickweed; Crabgrass; Fat-hen; Pigweed; Redshank; Fescue; Stinging nettle; Petty spurge; Ryegrass

Example applications: Vegetables including brassicas, peas & beans, onions, carrots, turnips; Strawberries; Cotton; Lucerne; Ornamentals; Lawns

Efficacy & activity: -

Availability status: Current

Introduction & key dates: circa 1960

EC Regulation 1107/2009 (repealing 91/414):
Status Not approved
Dossier rapporteur/co-rapporteur Greece
Date inclusion expires Expired
EU Candidate for substitution (CfS) -
Listed in EU database Yes

Approved for use () or known to be used () in the following European countries: Click to access a note on the approvals information on this site

AT

BE

BG

CY

CZ

DE

DK

EE

EL

ES

FI

FR

HR

HU

IE

IT

LT

LU

LV

MT

NL

PL

PT

RO

SE

SI

SK

UK

Also used in: Australia

Chemical structure: Click here for further information on the general chemical status information used on this site
Isomerism -
Chemical formula C8H6Cl4O4
Canonical SMILES COC(=O)C1=C(C(=C(C(=C1Cl)Cl)C(=O)OC)Cl)Cl
Isomeric SMILES No data
International Chemical Identifier key (InChIKey) NPOJQCVWMSKXDN-UHFFFAOYSA-N
International Chemical Identifier (InChI) InChI=1S/C10H6Cl4O4/c1-17-9(15)3-5(11)7(13)4(10(16)18-2)8(14)6(3)12/h1-2H3
2D structure diagram/image available? Yes

General status: Click here for further information on the general chemical status information used on this site
Pesticide type Herbicide
Substance group Benzenedicarboxylic acid
Minimum active substance purity -
Known relevant impurities -
Substance origin Synthetic
Mode of action Selective, non-systemic, acts by inhibiting seed germination. Microtubule assembly inhibition.
CAS RN 1861-32-1
EC number 217-464-7
CIPAC number 328
US EPA chemical code 078701
PubChem CID 2943
Molecular mass (g mol-1) 331.96
PIN (Preferred Identification Name) dimethyl 2,3,5,6-tetrachlorobenzene-1,4-dicarboxylate
IUPAC name dimethyl tetrachloroterephthalate
CAS name dimethyl 2,3,5,6-tetrachloro-1,4-benzenedicarboxylate
Other status information Chemical subject to PIC regulations
Relevant Environmental Water Quality Standards -
Herbicide Resistance Classification (HRAC) K1
Herbicide Resistance Classification (WSSA) 3
Insecticide Resistance Classification (IRAC) Not applicable
Fungicide Resistance Classification (FRAC) Not applicable
Examples of recorded resistance -
Physical state Colourless to grey crystalline powder
Related substances & organisms

Formulations:
Property Click here for information on the general product and branding information used on this site Value
Example manufacturers & suppliers of products using this active now or historically
  • Certis
  • Diamond Shamrock
Example products using this active
  • Dacthal
  • Decimate
UK LERAP status None
Formulation and application details Usually supplied as a wettable powder or granular formulation.


ENVIRONMENTAL FATE

for chlorthal-dimethyl

Property Click here for information on the parameters used to describe environmental fate on this site Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with fate data Interpretation Click here for information on the way in which we interpret environmental fate data
Solubility - In water at 20oC (mg l-1) 0.21 A5 Low
Solubility - In organic solvents at 20oC (mg l-1) 250000 L3 - Benzene -
170000 L3 - Toluene -
140000 L3 - Xylene -
100000 L3 - Acetone -
Melting point (oC) 156 A5 -
Boiling point (oC) 345 A5 -
Degradation point (oC) 360 L3 -
Flashpoint (oC) Not expected to self ignite; Not highly flammable A5 -
Octanol-water partition coefficient at pH 7, 20oC P 1.91 X 1004 Calculated -
Log P 4.28 A5 High
Bulk density (g ml-1)/Specific gravity 1.56 Q2 -
Dissociation constant (pKa) at 25oC Not applicable A5 -
Note: No dissociation
Vapour pressure at 20oC (mPa) 0.21 A5 Low volatility
Henry's law constant at 25oC (Pa m3 mol-1) 0.3486 A5 Moderately volatile
GUS leaching potential index Click here for a note on the limitations of the GUS index 1.01 Calculated Low leachability
SCI-GROW groundwater index (μg l-1) for a 1 kg ha-1 or 1 l ha-1 application rate Click here for a note on the limitations of the SCI-GROW index Value 2.05 X 10-02 Calculated -
Note -
Potential for particle bound transport index Click here for a note on the limitations of the potential for particle bound transport index - Calculated High
Maximum UV-vis absorption L mol-1 cm-1 212.4nm = 48000, 296.6nm = 1240, 290nm = 1030, 295nm = 1210, 304nm = 659, 314nm = 93.1 A5 -
Surface tension (mN m-1) - - -

Degradation:
Property Click here for information on the parameters used to describe substance degradation Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with degradation data Interpretation Click here for information on the way in which we interpret substance degradation data
General biodegradability -
Soil degradation (days) (aerobic) DT50 (typical) 59 A5 Moderately persistent
DT50 (lab at 20oC) 59 A5 Moderately persistent
DT50 (field) 47 A5 Moderately persistent
DT90 (lab at 20oC) 88 A5 -
DT90 (field) 156 A5 -
DT50 modelling endpoint - - -
Note EU dossier Lab studies DT50 range 25-97 days, DT90 range 65-166 days, Field studies DT50 range 6-98 days, DT90 range 20-328 days; Other sources: DT50 33.8 days (R4); 11-105 days (R4)
Dissipation rate RL50 on plant matrix Value - - -
Note -
Dissipation rate RL50 on and in plant matrix Value 37.8 R3 -
Note Kentucky bluegrass thatch, n=1
Aqueous photolysis DT50 (days) at pH 7 Value Stable A5 -
Note -
Aqueous hydrolysis DT50 (days) at 20oC and pH 7 Value Stable A5 -
Note -
Water-sediment DT50 (days) 39 A5 Moderately fast
Water phase only DT50 (days) 130 A5 Stable

Soil adsorption and mobility:
Property Click here for information on the parameters used to describe substance adsorption and mobility Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with adsorption and mobility data Interpretation Click here for information on the way in which we interpret substance adsorption and mobility
Linear Kd 37.0 A5 Slightly mobile
Koc 2963
Notes and range EU dossier Kd range 6.80-59.5 mL/g, Koc range 1500-4444 mL/g, Soils=8
Freundlich Kf 30.5 A5 Slightly mobile
Kfoc 2683
1/n 0.947
Notes and range EU dossier Kf range 6.67-70.3 mL/g, Kfoc range 1778-4375 mL/g, 1/n range 0.912-0.985, Soils=8
pH sensitivity No

Key metabolites:
Metabolite Formation medium Estimated maximum occurrence fraction 1107/2009 relevancy Click here for further information on 1107/2009 relevancy
2,3,5,6-tetrachloroterephthalic acid This metabolite may cause environmental pollution, click here for further information Soil   0.944   Relevant, Major fraction
monomethyl-tetrachloroterephthalic acid This metabolite may cause environmental pollution, click here for further information Soil   0.113   Relevant, Major fraction


ECOTOXICOLOGY

for chlorthal-dimethyl

Property Click here for information on the parameters used to describe substance ecotoxicology Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with ecotoxicology data Interpretation Click here for information on the way in which we interpret substance ecotoxicology
Bio-concentration factor BCF (l kg-1) 2574 A5 Threshold for concern
CT50 (days) 14 -
Mammals - Acute oral LD50 (mg kg-1) > 5000 A5 Rat Low
Mammals - Short term dietary NOEL (mg kg-1) 1 L2 Rat, 2 year High
(ppm diet) - -
Birds - Acute LD50 (mg kg-1) > 2250 A5 Colinus virginianus Low
Birds - Short term dietary (LC50/LD50) > 1637 mg/Kg BW/day A5 Colinus virginianus -
Fish - Acute 96 hour LC50 (mg l-1) > 4.7 A5 Oncorhynchus mykiss Moderate
Fish - Chronic 21 day NOEC (mg l-1) 0.056 A5 Oncorhynchus mykiss Moderate
Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) > 4.6 A5 Daphnia magna Moderate
Aquatic invertebrates - Chronic 21 day NOEC (mg l-1) 0.246 A5 Daphnia magna Moderate
Aquatic crustaceans - Acute 96 hour LC50 (mg l-1) - - -
Sediment dwelling organisms - Acute 96 hour LC50 (mg l-1) - - -
Sediment dwelling organisms - Chronic 28 day NOEC, static, water (mg l-1) - - -
Sediment dwelling organisms - Chronic 28 day NOEC, sediment (mg kg-1) - - -
Aquatic plants - Acute 7 day EC50, biomass (mg l-1) > 11 A5 Lemna gibba Low
Non-target plants - - -
- - -
Algae - Acute 72 hour EC50, growth (mg l-1) > 10 F5 Scenedemus subspicatus Low
Algae - Chronic 96 hour NOEC, growth (mg l-1) - - -
Honeybees (Apis spp.) Contact acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) > 100 A5 Low
Oral acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) > 100 A5 Low
Unknown mode acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) - - -
Bumblebees (Bombus spp.) Contact acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) - - -
-
Oral acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) - - -
-
Mason bees (Osmia spp.) Contact acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) - - -
Oral acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) - - -
Other pollinators (1) Acute LD50 (worst case from 24 , 48 and 72 hour values - μg insect-1) - - -
Mode of exposure -
Other pollinators (2) Acute LD50 (worst case from 24 , 48 and 72 hour values - μg insect-1) - - -
Mode of exposure -
Earthworms - Acute 14 day LC50 (mg kg-1) > 500 A5 Eisenia foetida, corr Moderate
Earthworms - Chronic 14 day NOEC, reproduction (mg kg-1) - - -
Other soil macro-organisms - e.g. Collembola LR50 / EC50 / NOEC / % Effect - - -
Other arthropod (1) LR50 g ha-1 485 A5 Aphidius rhopalosiphi -
% Effect - - -
Other arthropod (2) LR50 g ha-1 40000 >
A5 Typhlodromus pyri
-
% Effect - - -
Soil micro-organisms - - -
Mesocosm study data NOEAEC mg l-1 - - -
NOEAEC mg l-1 - - -


HUMAN HEALTH AND PROTECTION

for chlorthal-dimethyl

General:
Property Click here for information on the parameters used to describe human health and protection issues Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with human health and protection data Interpretation Click here for information on the way in which we interpret human health and protection data
Threshold of Toxicological Concern (Cramer Class) Click here for a note on the limitations of the Cramer class High (class III) - -
Mammals - Acute oral LD50 (mg kg-1) > 5000 A5 Rat Low
Mammals - Dermal LD50 (mg kg-1 body weight) > 2000 A5 Rat -
Mammals - Inhalation LC50 (mg l-1) > 4.48 A5 Rat -
Other Mammal toxicity endpoints - -
ADI - Acceptable Daily Intake (mg kg-1bw day-1) 0.01 A5 Rat, SF=100 -
ARfD - Acute Reference Dose (mg kg-1bw day-1) 0.5 A5 Rat, SF=100 -
AAOEL - Acute Acceptable Operator Exposure Level (mg kg-1 bw day-1) - - -
AOEL - Acceptable Operator Exposure Level - Systemic (mg kg-1bw day-1) None allocated A4 Rat, SF=100 -
Dermal penetration studies (%) 6-8 A5 concentration dependent -
Dangerous Substances Directive 76/464 - - -
Exposure Routes Public Negligible risk to the public
Occupational Acceptable risk with PPE/PPC
European MRLs Click here for the EU MRL pesticide database
Drinking Water Standards - - -
Drinking Water MAC (μg l-1) - - -

Health issues:
Carcinogen Genotoxic Endocrine disrupter Reproduction / development effects Cholinesterase inhibitor Neurotoxicant

A3; B2; C3; D0; E3

-

-

-

Respiratory tract irritant Skin irritant Skin sensitiser Eye irritant Phototoxicant

-

-

General human health issues Possible liver, thyroid & lung toxicant
USEPA - possible human carcinogen
Key: Genotoxicity
A: Chromosome aberration (EFSA database)
B: DNA damage/repair (EFSA database)
C: Gene mutation (EFSA database)
D: Genome mutation (EFSA database)
E: Unspecified genotoxicity type (miscellaneous data source)
0: No data
1: Positive
2: Mixed/ambiguous results
3: Negative
Key: Other
: Yes, known to cause a problem
: No, known not to cause a problem
: Possibly, status not identified
- : No data found

Handling issues:
Property Click here for information on the parameters used to describe substance handling issues Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with data on handling issues Interpretation Click here for information on the way in which we interpret data on handling issues
General Click here for a description of the International Maritime Dangerous Goods (IMDG) codes Not explosive or oxidising
CLP classification 2013 Environment: H400, H410
EC Risk Classification Click here to view information omn the EU risk phrases Xn - Harmful: R22
Xi - Irritant: R36/38
EC Safety Classification Click here to view information omn the EU safety phrases S22, S26, S36/37
WHO Classification III - Slightly hazardous
UN Number 2811
Waste disposal & packaging Click here for a description of UN packaging marks -


TRANSLATIONS

for chlorthal-dimethyl

Language Name
English chlorthal-dimethyl
French chlorthal-dimethyle
German Chlorthal-dimethyl
Danish chlorthal-dimethyl
Italian clortal-dimetile
Spanish clortal-dimetil
Greek -
Slovenian klortal-dimetil
Polish chlortal dimetylowy
Swedish -
Hungarian -
Dutch -

Record last updated: Friday 28 June 2019
Contact: aeru@herts.ac.uk